CN113484800B - Method, device, equipment and medium for detecting turn-to-turn faults of transformer winding - Google Patents
Method, device, equipment and medium for detecting turn-to-turn faults of transformer winding Download PDFInfo
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- CN113484800B CN113484800B CN202110800343.6A CN202110800343A CN113484800B CN 113484800 B CN113484800 B CN 113484800B CN 202110800343 A CN202110800343 A CN 202110800343A CN 113484800 B CN113484800 B CN 113484800B
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- 238000004804 winding Methods 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000013178 mathematical model Methods 0.000 claims abstract description 82
- 238000001514 detection method Methods 0.000 claims description 12
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
The application discloses a method, a device, equipment and a medium for detecting turn-to-turn faults of a transformer winding, wherein the method comprises the following steps: acquiring an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state before the operation of the transformer and in a winding turn-to-turn fault state; acquiring target voltage and current of a primary side of the transformer before operation and during operation, and determining target idle active power loss, target idle reactive power and target active power total harmonic distortion rate of the transformer before operation and during operation; and detecting whether the winding turn-to-turn faults of the transformer occur according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate. According to the method, whether the winding turn-to-turn faults of the transformer occur or not can be detected without power failure of the transformer, so that user experience of a user in detecting the winding turn-to-turn faults of the transformer can be remarkably improved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method, a device, equipment and a medium for detecting turn-to-turn faults of a transformer winding.
Background
In fault detection of a transformer, inter-turn faults of the transformer are difficult to detect because the inter-turn faults have less influence on the performance of the transformer. However, if the turn-to-turn fault of the transformer cannot be quickly identified, the fault range is expanded, and more serious loss is caused.
In the prior art, an offline method is generally adopted to detect whether a turn-to-turn fault occurs in a winding of a transformer, but the detection method needs to perform power failure detection on the transformer, consumes time and labor, and greatly influences user experience. Currently, there is no more effective solution to this technical problem.
Disclosure of Invention
Therefore, the invention aims to provide a method, a device, equipment and a medium for detecting turn-to-turn faults of a transformer winding, so as to improve user experience when a user detects the turn-to-turn faults of the transformer winding. The specific scheme is as follows:
a method for detecting turn-to-turn faults of a transformer winding comprises the following steps:
acquiring an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state before the operation of the transformer and in a winding turn-to-turn fault state;
acquiring target voltage and current of the primary side of the transformer before operation and during operation;
determining a target idle active power loss, a target idle reactive power and a target active power total harmonic distortion rate of the transformer before operation and during operation respectively by using the target voltage and current, the idle active power loss mathematical model, the idle reactive power mathematical model and the active power total harmonic distortion rate mathematical model;
and detecting whether the transformer has winding turn-to-turn faults according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate.
Preferably, the expression of the no-load active power loss mathematical model is:
the expression of the no-load reactive power mathematical model is as follows:
the expression of the active power total harmonic distortion mathematical model is as follows:
where the subscript k denotes the kth harmonic component,the subscript n is 1, the normal state is represented, the subscript n is 2, the internal fault state is represented, I m1 Representing fundamental frequency component of exciting current of the transformer before operation, I m2 Representing fundamental frequency component of exciting current of the transformer in winding turn-to-turn fault state, I c1 Representing fundamental frequency component of core loss current of the transformer before operation, I c2 The fundamental frequency component of the iron core loss current of the transformer in the winding turn-to-turn fault state is represented, and alpha and beta respectively represent the phase angle difference of the voltage and the current of the transformer before operation and in the winding turn-to-turn fault state.
Preferably, the process of obtaining the target voltage and current of the primary side of the transformer before the operation and during the running includes:
and acquiring target currents of the primary side of the transformer before the operation and during the operation by using a current sensor.
Preferably, the current sensor is embodied as ACS712.
Preferably, the method further comprises:
and recording the target current by using an oscilloscope.
Preferably, the process of detecting whether the transformer has winding turn-to-turn faults according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate includes:
respectively obtaining reference power loss, reference reactive power, reference distortion rate, running power loss, running reactive power and running distortion rate of the transformer before operation and during running according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate;
and if the reference power loss is smaller than the running power loss, the reference reactive power is larger than the running reactive power and the reference distortion rate is larger than the running distortion rate, judging that the transformer has winding turn-to-turn faults.
Correspondingly, the invention also discloses a device for detecting the turn-to-turn faults of the transformer winding, which comprises the following steps:
the model acquisition module is used for acquiring an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state before the operation of the transformer and in a winding turn-to-turn fault state;
the parameter acquisition module is used for acquiring target voltage and current of the primary side of the transformer before operation and during operation;
the parameter calculation module is used for respectively determining target empty active power loss, target empty reactive power and target active power total harmonic distortion rate of the transformer before operation and during operation by using the target voltage and current, the empty active power loss mathematical model, the empty reactive power mathematical model and the active power total harmonic distortion rate mathematical model;
and the fault judging module is used for detecting whether the winding turn-to-turn fault occurs to the transformer according to the target idle active power loss, the target idle reactive power and the target active total harmonic distortion rate.
Correspondingly, the invention also discloses a device for detecting the turn-to-turn faults of the transformer winding, which comprises the following components:
a memory for storing a computer program;
a processor for implementing the steps of a method for detecting a transformer winding turn-to-turn fault as disclosed above when executing said computer program.
Correspondingly, the invention also discloses a computer readable storage medium, wherein the computer readable storage medium is stored with a computer program, and the computer program realizes the steps of the method for detecting the turn-to-turn faults of the transformer winding when being executed by a processor.
Therefore, in the invention, firstly, under the fault state before the operation of the transformer and among windings, an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state are obtained, and target voltage and current of the primary side of the transformer before the operation and during the operation are obtained; then, calculating the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate of the transformer before and during operation respectively by using the target voltage and current, the idle active power loss mathematical model, the idle reactive power mathematical model and the active power total harmonic distortion mathematical model; and finally, detecting whether the transformer has winding turn-to-turn faults according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate. Obviously, the method can detect whether the transformer has winding turn-to-turn faults or not without power failure of the transformer, so that the user experience of a user in detecting the winding turn-to-turn faults of the transformer can be remarkably improved. Correspondingly, the device, the equipment and the medium for detecting the turn-to-turn faults of the transformer winding have the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for detecting a turn-to-turn fault of a transformer winding according to an embodiment of the present invention;
FIG. 2 is a graph of no-load current phasors for a transformer prior to commissioning and in winding turn-to-turn fault conditions;
FIG. 3 is a block diagram of a device for detecting turn-to-turn faults of a transformer winding according to an embodiment of the present invention;
fig. 4 is a block diagram of a transformer winding turn-to-turn fault detection device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for detecting a turn-to-turn fault of a transformer winding according to an embodiment of the present invention, where the method includes:
step S11: acquiring an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state before the operation of the transformer and in a winding turn-to-turn fault state;
step S12: acquiring target voltage and current of a primary side of the transformer before operation and during running;
step S13: respectively determining target idle active power loss, target idle reactive power and target active power total harmonic distortion rate of the transformer before operation and during operation by using a target voltage and current, an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion rate mathematical model;
step S14: and detecting whether the winding turn-to-turn faults of the transformer occur according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate.
In this embodiment, a method for detecting a winding turn-to-turn fault of a transformer is provided, and by using the method, whether the winding turn-to-turn fault of the transformer occurs or not can be detected without power failure of the transformer, so that user experience of a user in detecting the winding turn-to-turn fault of the transformer can be remarkably improved.
In the method, firstly, an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state are obtained before the operation of the transformer and in a winding turn-to-turn fault state. It can be appreciated that the fault detection accuracy and sensitivity of the no-load state of the transformer are far higher than the detection result of the transformer in the normal operation state when the winding turn-to-turn faults occur. Therefore, in this embodiment, in order to improve the detection result of the turn-to-turn fault of the transformer winding, an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state are obtained.
And then, acquiring target voltage and current of the primary side of the transformer before operation and during operation, and respectively determining target idle active power loss, target idle reactive power and target active power total harmonic distortion rate of the transformer before operation and during operation according to the target voltage and current, the idle active power loss mathematical model, the idle reactive power mathematical model and the active power total harmonic distortion rate mathematical model.
The target voltage and current comprise the voltage and current of the transformer at the primary side before operation and the voltage and current of the transformer at the primary side during operation, the target idle active power loss comprises the idle active power loss of the transformer before operation and the idle active power loss of the transformer during operation, the target idle reactive power comprises the idle reactive power of the transformer before operation and the idle reactive power of the transformer during operation, and the target active power total harmonic distortion comprises the active power total harmonic distortion of the transformer before operation and the active power total harmonic distortion of the transformer during operation.
It can be understood that if the transformer has winding turn-to-turn faults, various operation parameters of the transformer, especially, the no-load active power loss, no-load reactive power and active power total harmonic distortion rate of the transformer in the no-load state, must be changed, so that whether the transformer has winding turn-to-turn faults can be judged according to the attribute characteristics of the transformer. That is, by comparing the idle active power loss, idle reactive power and active power total harmonic distortion rate of the transformer before and during operation, it can be determined whether the transformer has winding turn-to-turn faults.
Compared with the prior art, the method can detect whether the winding turn-to-turn faults occur or not without power failure of the transformer, so that the user experience of a user in detecting the winding turn-to-turn faults of the transformer can be remarkably improved.
It can be seen that, in this embodiment, firstly, in the fault state before the operation of the transformer and between windings, an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state are obtained, and a target voltage and current of the primary side of the transformer before the operation and during the operation are obtained; then, calculating the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate of the transformer before and during operation respectively by using the target voltage and current, the idle active power loss mathematical model, the idle reactive power mathematical model and the active power total harmonic distortion mathematical model; and finally, detecting whether the transformer has winding turn-to-turn faults according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate. Obviously, the method can detect whether the transformer has winding turn-to-turn faults or not without power failure of the transformer, so that the user experience of a user in detecting the winding turn-to-turn faults of the transformer can be remarkably improved.
Based on the above embodiment, the technical solution is further described and optimized in this embodiment, and as a preferred implementation manner, the expression of the space-borne power loss mathematical model is:
the expression of the no-load reactive power mathematical model is:
the expression of the active power total harmonic distortion mathematical model is as follows:
where the subscript k denotes the kth harmonic component,the subscript n is 1, the normal state is represented, the subscript n is 2, the internal fault state is represented, I m1 Representing fundamental frequency component of exciting current of transformer before operation, I m2 Representing fundamental frequency component of exciting current of transformer in winding turn-to-turn fault state, I c1 Representing fundamental frequency component of core loss current of transformer before operation, I c2 The fundamental frequency component of the core loss current of the transformer in the winding turn-to-turn fault state is represented, and alpha and beta respectively represent the phase angle difference of the voltage and the current of the transformer before operation and in the winding turn-to-turn fault state.
In practical application, no-load currents of the primary side of any phase of the transformer based on the Fourier series before operation and under winding turn-to-turn faults are respectively as follows:
wherein i is k And i kf The current of the kth harmonic of the transformer before operation and in the winding turn-to-turn fault state is respectively, t is a time variable, I k And I kf The amplitude of the kth harmonic current of the transformer before operation and in the winding turn-to-turn fault state is respectively that omega is the angular frequency and theta k And theta kf The initial phase angle of the kth harmonic current of the transformer before operation and in the winding turn-to-turn fault state is respectively set.
Under the condition of neglecting even harmonic, the effective current values of the transformer before operation and in the winding turn-to-turn fault state are respectively as follows:
I 0 ＝I 1 ∠-θ 1 +I 3 ∠-θ 3 +I 5 ∠-θ 5 +…；
I 0f ＝I 1f ∠-θ 1f +I 3f ∠-θ 3f +I 5f ∠-θ 5f +…；
wherein I is 1f ∠-θ 1f ＝I 1 ∠-θ 1 +I′ f ∠-θ f ，I′ f For fault current through short turn parallel circuit, θ f Is I' f Is a primary phase angle of (c).
The current of the transformer in the no-load state consists of two parts, namely magnetizing current and core loss current, and the magnetizing current and the core loss current respectively generate reactive power and active power. The no-load input of the transformer is the active and reactive power it consumes. The nominal voltage and nominal frequency are now applied to one side of the transformer winding, the other side being open or empty. The no-load power loss includes hysteresis loss of the iron core, eddy current loss of the iron core and copper loss of no-load current, and copper loss caused by no-load current is negligible, so that the hysteresis loss and the eddy current loss constitute no-load active power loss of the transformer.
Referring to fig. 2, fig. 2 is a diagram of an empty current phasor of the transformer before operation and in a winding turn-to-turn fault state. In FIG. 2, I 01 For the fundamental frequency component of no-load current of the transformer before operation, I m1 For the fundamental frequency component of exciting current before the transformer is put into operation, I c1 For the fundamental frequency component of the core loss current of the transformer before operation, I 02 For the fundamental frequency component of no-load current of the transformer in the winding turn-to-turn fault state, I m2 For fundamental frequency component of exciting current of transformer in winding turn-to-turn fault state, I c2 The method is characterized in that the fundamental frequency component of the core loss current of the transformer in the winding turn-to-turn fault state is obtained, VL is a voltage vector, and alpha and beta are phase angle differences of voltage and current of the transformer before operation and in the winding turn-to-turn fault state respectively.
As can be seen from fig. 2, the no-load current of the transformer before operation and in the winding turn-to-turn fault condition can be expressed as:
in the formula, when the subscript n is 1, the normal state is represented, and when the subscript n is 2, the internal fault state is represented.
The magnetizing current and the core loss current of the transformer in the no-load state are respectively as follows:
I m1 ＝|I 01 |sin(α)、I m2 ＝|I 02 |sin(β)、I c1 ＝|I 01 cos (alpha) and I c2 ＝|I 02 |cos(β)；
Then the expression of the active power loss and reactive power of the transformer in the no-load state is:
in general, the voltage may contain other harmonic components, and therefore, the expression of the mathematical model of the no-load active power loss of the transformer is:
the expression of the no-load reactive power mathematical model of the transformer is as follows:
where the subscript k represents the kth harmonic component.
The active power total harmonic distortion mathematical model expression of the transformer can be obtained by calculating the active harmonic of the transformer before operation and in the winding turn-to-turn fault state, and the active power total harmonic distortion mathematical model expression is as follows:
based on the above embodiments, the present embodiment further describes and optimizes a technical solution, and as a preferred implementation manner, a process for obtaining a target voltage and a target current of a primary side of a transformer before operation and during operation includes:
and acquiring target currents of the primary side of the transformer before operation and during operation by using a current sensor.
When the target voltage and current of the primary side of the transformer before operation and during operation are obtained, rated power frequency voltage is firstly required to be applied to the primary side of the transformer before the transformer leaves the factory and operation, the secondary side of the transformer is set to be in an open circuit or light load state, then, the primary current of the transformer before operation is collected by using a current sensor, and finally, the rated power frequency voltage applied to the primary side of the transformer and the primary current of the transformer before operation are substituted into an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state, so that the idle active power loss, the idle reactive power and the active power total harmonic distortion of the transformer before operation can be calculated.
By the same method, rated power frequency voltage is applied to the primary side of the transformer in the operation process of the transformer, the secondary side of the transformer is set to be in an open circuit or light load state, then a current sensor is used for collecting primary current of the transformer in the operation process, and finally the rated power frequency voltage applied to the primary side of the transformer and the primary current of the transformer in the operation process are substituted into an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state, so that the idle active power loss, the idle reactive power and the active power total harmonic distortion of the transformer in the operation process can be calculated. Specifically, in practical applications, the current sensor may be set to ACS712 and the capacity of the current sensor may be set to 30A.
In addition, after the primary current of the transformer before operation and the primary current of the transformer in the winding turn-to-turn fault state are acquired by using the current sensor, in order to facilitate the subsequent calculation process, the oscilloscope can be used for recording and displaying the target current of the primary side of the transformer before operation and during operation, that is, the oscilloscope is used for recording and displaying the primary current of the transformer before operation and the primary current of the transformer during operation.
Obviously, by the technical scheme provided by the embodiment, the subsequent parameter calculation process of the transformer can be more accurate and reliable.
Based on the above embodiment, this embodiment further describes and optimizes the technical solution, as a preferred implementation manner, the steps are as follows: the process for detecting whether the transformer has winding turn-to-turn faults according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate comprises the following steps:
respectively obtaining reference power loss, reference reactive power, reference distortion rate, operation power loss, operation reactive power and operation distortion rate of the transformer before operation and during operation according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate;
and if the reference power loss is smaller than the operation power loss, the reference reactive power is larger than the operation reactive power and the reference distortion rate is larger than the operation distortion rate, judging that the winding turn-to-turn fault occurs in the transformer.
It can be understood that when the transformer has winding turn-to-turn faults, the exciting current of the transformer is reduced, the core loss current is increased, the reactive power component is reduced and the active power component is increased, so that the active power loss and the reactive power of the transformer can be used as criteria for detecting the winding turn-to-turn faults of the transformer. And, when the transformer has winding turn-to-turn faults, the components of the third harmonic and the fifth harmonic of the transformer in the no-load state are reduced, the fundamental component of the no-load current is increased, and the voltage is basically unchanged, so that when the transformer has winding turn-to-turn faults, the active power total harmonic distortion rate of the transformer is reduced.
Based on the working characteristics of the transformer, when judging whether the transformer has winding turn-to-turn faults, firstly, respectively acquiring reference power loss, reference reactive power, reference distortion rate, operation power loss, operation reactive power and operation distortion rate of the transformer before and during operation according to target idle active power loss, target idle reactive power and target active power total harmonic distortion rate; if the reference power loss of the transformer before operation is smaller than the operation power loss of the transformer in the operation state, the reference reactive power of the transformer before operation is larger than the operation reactive power of the transformer in the operation state, and the reference distortion rate of the transformer before operation is larger than the operation distortion rate of the transformer in the operation state, the situation that the transformer has winding turn-to-turn faults is indicated, and power failure maintenance is needed. If all the three judgment conditions are not met, the transformer is in a normal running state, and power failure maintenance is not needed.
Therefore, by the technical scheme provided by the embodiment, whether the winding turn-to-turn faults of the transformer occur can be accurately judged.
Referring to fig. 3, fig. 3 is a block diagram of a device for detecting turn-to-turn faults of a transformer winding according to an embodiment of the present invention, where the device includes:
the model obtaining module 21 is configured to obtain an empty active power loss mathematical model, an empty reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an empty state before the transformer is put into operation and in a winding turn-to-turn fault state;
the parameter obtaining module 22 is used for obtaining the target voltage and current of the primary side of the transformer before operation and during operation;
the parameter calculation module 23 is configured to determine a target idle active power loss, a target idle reactive power and a target active power total harmonic distortion rate of the transformer before and during operation by using the target voltage and current, the idle active power loss mathematical model, the idle reactive power mathematical model and the active power total harmonic distortion rate mathematical model, respectively;
the fault judging module 24 is configured to detect whether a winding turn-to-turn fault occurs in the transformer according to the target idle active power loss, the target idle reactive power and the target active total harmonic distortion rate.
The device for detecting the turn-to-turn faults of the transformer winding has the beneficial effects of the method for detecting the turn-to-turn faults of the transformer winding.
Referring to fig. 4, fig. 4 is a block diagram of a detection device for turn-to-turn faults of a transformer winding according to an embodiment of the present invention, where the detection device includes:
a memory 31 for storing a computer program;
a processor 32 for implementing the steps of a method for detecting a transformer winding turn-to-turn fault as disclosed above when executing a computer program.
The detection equipment for the transformer winding turn-to-turn faults has the beneficial effects of the detection method for the transformer winding turn-to-turn faults.
Correspondingly, the embodiment of the invention also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the method for detecting the turn-to-turn faults of the transformer winding when being executed by a processor.
The computer readable storage medium provided by the embodiment of the invention has the beneficial effects of the method for detecting the turn-to-turn faults of the transformer winding.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The method, the device, the equipment and the medium for detecting the turn-to-turn faults of the transformer winding provided by the invention are described in detail, and specific examples are applied to illustrate the principle and the implementation mode of the invention, and the description of the above examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (8)
1. The method for detecting the turn-to-turn faults of the transformer winding is characterized by comprising the following steps of:
acquiring an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state before the operation of the transformer and in a winding turn-to-turn fault state;
acquiring target voltage and current of the primary side of the transformer before operation and during operation;
determining a target idle active power loss, a target idle reactive power and a target active power total harmonic distortion rate of the transformer before operation and during operation respectively by using the target voltage and current, the idle active power loss mathematical model, the idle reactive power mathematical model and the active power total harmonic distortion rate mathematical model;
detecting whether a winding turn-to-turn fault occurs to the transformer according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate;
the expression of the no-load active power loss mathematical model is as follows:
，/>，/>；
the expression of the no-load reactive power mathematical model is as follows:
，/>，/>；
the expression of the active power total harmonic distortion mathematical model is as follows:
，/>；
in the subscriptIndicate->Subharmonic component (S)>Subscript->When 1, the normal state is indicated, subscript +.>When 2, it indicates an internal fault state, +.>Representing the fundamental frequency component of the excitation current of the transformer before operation, < >>Representing the fundamental frequency component of the exciting current of the transformer in the winding turn-to-turn fault state +.>Representing the fundamental frequency component of the core loss current of the transformer before operation, < >>Representing the fundamental frequency component of the core loss current of the transformer in the winding turn-to-turn fault state, +.>And->Representing the phase angle difference of the voltage and the current of the transformer before operation and in the winding turn-to-turn fault state respectively,/for>For the transformer->Voltage vector of subharmonic component,/->For the fundamental component of the active power of the transformer, < > for>Is the active power loss of the transformer in the no-load state.
2. The method of claim 1, wherein the process of obtaining the target voltage and current of the primary side of the transformer before and during the operation comprises:
and acquiring target currents of the primary side of the transformer before the operation and during the operation by using a current sensor.
3. The method according to claim 2, wherein the current sensor is in particular an ACS712.
4. The method of detecting according to claim 2, further comprising:
and recording the target current by using an oscilloscope.
5. The method according to claim 1, wherein the process of detecting whether the transformer has a winding turn-to-turn fault according to the target idle active power loss, the target idle reactive power, and the target active power total harmonic distortion rate comprises:
respectively obtaining reference power loss, reference reactive power, reference distortion rate, running power loss, running reactive power and running distortion rate of the transformer before operation and during running according to the target idle active power loss, the target idle reactive power and the target active power total harmonic distortion rate;
and if the reference power loss is smaller than the running power loss, the reference reactive power is larger than the running reactive power and the reference distortion rate is larger than the running distortion rate, judging that the transformer has winding turn-to-turn faults.
6. A device for detecting turn-to-turn faults of a transformer winding, comprising:
the model acquisition module is used for acquiring an idle active power loss mathematical model, an idle reactive power mathematical model and an active power total harmonic distortion mathematical model of the transformer in an idle state before the operation of the transformer and in a winding turn-to-turn fault state;
the parameter acquisition module is used for acquiring target voltage and current of the primary side of the transformer before operation and during operation;
the parameter calculation module is used for respectively determining target empty active power loss, target empty reactive power and target active power total harmonic distortion rate of the transformer before operation and during operation by using the target voltage and current, the empty active power loss mathematical model, the empty reactive power mathematical model and the active power total harmonic distortion rate mathematical model;
the fault judging module is used for detecting whether a winding turn-to-turn fault occurs to the transformer according to the target idle active power loss, the target idle reactive power and the target active total harmonic distortion rate;
the expression of the no-load active power loss mathematical model is as follows:
，/>，/>；
the expression of the no-load reactive power mathematical model is as follows:
，/>，/>；
the expression of the active power total harmonic distortion mathematical model is as follows:
，/>；
in the subscriptIndicate->Subharmonic component (S)>Subscript->When 1, the normal state is indicated, subscript +.>When 2, it indicates an internal fault state, +.>Representing the fundamental frequency component of the excitation current of the transformer before operation, < >>Representing the fundamental frequency component of the exciting current of the transformer in the winding turn-to-turn fault state +.>Representation ofThe fundamental frequency component of the core loss current of the transformer before operation, < >>Representing the fundamental frequency component of the core loss current of the transformer in the winding turn-to-turn fault state, +.>And->Representing the phase angle difference of the voltage and the current of the transformer before operation and in the winding turn-to-turn fault state respectively,/for>For the transformer->Voltage vector of subharmonic component,/->For the fundamental component of the active power of the transformer, < > for>Is the active power loss of the transformer in the no-load state.
7. A detection apparatus for a transformer winding turn-to-turn fault, comprising:
a memory for storing a computer program;
a processor for implementing the steps of a method for detecting a transformer winding turn-to-turn fault as claimed in any one of claims 1 to 5 when executing said computer program.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of a method for detecting a transformer winding turn-to-turn fault as claimed in any one of claims 1 to 5.
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